Planets in our Solar System

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Across
  1. 2. Mountains that erupt molten rock
  2. 4. Uranus' axis is tilted on its side
  3. 6. Jupiter's largest moons discovered first
  4. 7. Objects that orbit planets
  5. 9. Another name for planets and moons
  6. 10. The topography or surface features
Down
  1. 1. Tall peaked formations on planets
  2. 3. Gaseous layer around a planet
  3. 5. How compacted the matter inside is
  4. 8. The outer solid layer of a world